Steam-engine valve



(No Model.) 2 'sheets-sheet 1.

W. s. PATTIN, Wim. MORS an D. P. PATTIN. STEAM ENGINE VALVE.

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ATTORNEYS (No Mode-1.) .zusneets-sheet l2. W. S. PATTIN, W. M. MORSE 8vD. P. PATTIN. STEAM ENGINE VALVE.-

110.469-,173- Patented Peb. 16, 1892.

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UNITED STATES PATENT OFFICE.

lVlNFIELD S. PATTIN, WILLIAM M.` MORSE, AND DOUGLAS P. PATTIN, OFMARIETTA, OHIO.

STEAM-ENGINE VALVE.

SPECIFICATION forming part of Letters Patent No. 469,173, dated February16, 1892.

' Application filed November '7, 1891. Serial No. t11,237. (No model.)

v To cir/ZZ whom it may concern.-

Be it known that we, WINFIELD S. PATTIN, WILLIAM M. MORSE, and DOUGLASP. PATTIN, citizens of the United States, residing at Marietta,in thecounty of Washington and State of Ohio, have invented certain new anduseful Improvements in Steam-Engine Valves, of which the following is aspecication.

Our invention relates 'to improvements in that class of steam-valvesthat are employed on steam-pumps and like engines of reciprocatingmovement where the main steam-Valve is moved by a secondarysteam-piston, which in turn is moved by an auxiliary valve, saidauxiliary valve being operated by knockers moved by the direct action ofthe main steampiston.

Our invention more particularly relates to improvements in thearrangement of steamports, valve-seats, steam-pockets, the., which wesecure by a central plate, and to the peculiar form and arrangementofthe auxiliary Valve and tappets or knockers, as hereinafter fullydescribed.

Figure-1 is a vertical longitudinal section of a steam-cylinder, valve,and valve-chest, taken on lines'E2 F2, Fig. 4. Fig. 2 is a verticallongitudinal section of a steam-cylinder, main and auxiliary valves, andsteam-chest on line G2 H2, Fig. 5. Fig. 3 is a vertical longitudinalsection of a steam-cylinder, auxiliary valve, steam chest, and knockerson line 12 J2, Fig. 5. Fig. 4 is a vertical cross-section of asteam-cylinder, valves, and chest on line A2 B2, Fig. l. Fig. 5 is averticalcross-section of a steam-cylinder, valves, and chest on line O2D2, Figs. 2 and Figs. 6 and 7 are a bottom and top plan, respectively,of the central plate N. Figs. 8 and 9 are a bottom and top view,respectively, of the auxiliary valve X. Figs. 10 and 1l are side viewsof the two knockers or tappets -K K. Fig. l2 is a top plan ofmain-cylinder casting, showing knocker-grooves, main steam-ports S S',and exhaust-port Y.-

Similar letters refer to similar parts throughout the several views.

P is the main steam-piston, and Z the piston-rod. j

V is the main steamevalve, and A the valve or secondary piston, havingheads of unequal area and provided with suitable packingrings.

N is the central plate, (shown in top and bottom views in Figs. 7 and 6,respectively,) in

which plate are the main steam-ports S S the main exhaust-port E, theexhaust-port Y for4 auxiliary valve, the auxiliaryvalve steamports C C',leading to ends of piston A, the steam-pockets Q Q to admit steam underauxiliary valve, and the cavities U U, through which the knockers K Kproject into the cavities T T in under side of auxiliary valve. (SeeFig. 8.) The central plate N rises into the steam-chest (see Fig. l) andforms the seats of main valve V and also of auxiliary Valve X. Itfurther forms a steam-tight joint between the two knocker-cavities O O',Fig. 12, and in connection with the auxiliary valve X forms asteam-tight joint between the two knocker-cavities O O', so that nosteam can blowthrough from one end of cylinder to the other.

X is the auxiliary valve, (shown in top and bottom views in Figs. 9 and8, respectively,) in which T T are cavities, into which the knockers K Kproject in order to move the valve.

F F aresquare openings through the valve, through which live steam isadmitted from the steam-space L, Figs. 4 and 2, to the ends of auxiliarypiston through the steam-pockets Q Q in central plate and thesteam-pockets R R in under side of auxiliary valve, Vthence (see Fig. 2)through the ports C C', Fig. 6, to end of piston A, Fig. 1. The pocketsR R in under side of auxiliary valve are both livesteam and exhaustpockets, since when one is a live-steam the other is an exhaust pocket;but the steam-pockets Q Q in center plate are always live-steam pockets.

The knockers K K', Figs. lO and l1, slide in groovesO O in main-cylindercasting, projecting downward into the main cylinder (see Fig. 3) so asto be moved by the main steampiston P, the heads of main cylinder havingsuitable recesses into which knockers move, so that by no possibilitycan they be caught and broken by main piston P. The knockers K Kalso'project upward into cavities in un- IOC der side of auxiliaryvalve, as heretofore described. Y

The exhaust-opening Y under auxiliary valve is made Very large, asshown, in order to insure the seating of said valve when working inavertical position, as when applied toy locomotive air-pumps.

the cylinder-casting and covered by the central plate and auxiliaryvalve, and being two solid pieces of wrought iron or steel, are notliable to any injury or to getting out of ord er, as might be the casein hinged tappets or connected tappets.

The method of operation is as follows: Referring to Fig. 1, the actionof the main valve V over the two Vinduction-,I )orts S S' Aand the`intermediate exhaust-port E is the ordinary; and well-known action o fthe D-valve-that' is .to say, in the position shown in this viewv steam.is entering at the right-hand end of the Figs. l, 2, and,3,theknocker Kismoved to the right, as shown in Fig. 8, carrying with it the auxiliaryvalve X to the position shown in Fig. 2. Steam is then admitted from thecentral` cavity of steam-chest L (seeFig. 4) through the opening F, Fig.2, in auxiliary valve, thence through steam-pocket Q in central plate,

thence through steam-pocket Rin under side of auxiliary valve,throughport C in central plate, an d` in steam-chest to ri ght-hand endof piston A, thus throwing4 piston A, carrying .main valve V, toposition shown in Fig. 2. At this time steam is admitted through mainport. S to right-hand end of main piston P, when conditions are ready tocommence return stroke. Meantime exhaust has taken place from left-handhead of valve-piston A, through port C and valve-pocket R' to mainexhaust Y.

Ve are aware that various forms of auxiliaryvalves operated by knockers,levers, or

tappets in the cylinder have been heretofore provided. Our invention ischiefly distinctive in the separate central plate N, in which thevarious ports or openings are formed and through which the knockersoperate upon the auxiliary valve. This plate entirely sepaj rates thetwo knocker-chambers and prevents The knockers K K', being entirelywithin leakage of steam from one to the other by making close contactbetween the lower side of the auxiliary valves and the top side of thecylinder at a point between the knockers. This enables us to cheaplyconstruct an engine of this type with but few parts and with nonecessity 4of any nicety of adjustment. Furthermore, all the joints areground joints, and all gaskets are done away with.

Having thus described our invention, what we claim asnew,fand desiretosecurebyLetters Patent, is- Jl p -l. In a steam-cylinder having apiston-actuated slide-valve, the vcombination of thesliding knockers KK', theauxiliary valve X, engaged by said knockers and moving Awiththem, and theintermediateplate N, having openings lthrough which itsknockers pass in `connecting with the valve, the said plate serving'tomake a tight connection between the lower sideof said valve and theupper surface of vthe cylinder at a point between the knockers, wherebythe knocker-chambers are entirely separated from each other, substantially as shown and described. Y

2. The central plate N, having the main ports E S S', knocker-holes UU', passages C C', and recesses Q Q', in vcombination with the auxiliaryvalve X, with knocker-recesses' T T', openings F F', and recesses R R',and the knockers K K', slidingin the cylinder and extending through thecentral plate into the recesses T T of the auxiliary valve,substantially as shown and described.

WINFIELD SPATTIN. WILLIAM M. MORSE. DOUGLAS P. PATTIN. Witnesses:

A. L. SMITH, PHIL. BACHMANN.

